The only cranks Rod currently has in inventory are 360 main 4.125 and 4.250.
I have an assembled 4 inch 418 i plan to use with trick flows. To big for those heads but i have limited goals( lower 10’s)
I think you’ll be in good shape.
The way I see it, the engine could use more head but at the same time, it can make do with what your plan is. Pittsburgh racer has an excellent example though he is very light weight, the other end of the equation..... power to weight....
I forget what the trick flows flow but 300 cfm area is enough to make enough power to do your ET number. Of course, how you get it done is one of many ways the cat is skinned. I wouldn’t be worried about it. You did well with the W5’s. How well did there numbers do vs the Trick flows?